function surfto(form) {
  if ( form.name == "zeitschrift" ) {
    var myindex=form.urlzeitschrift.selectedIndex
    location=form.urlzeitschrift.options[myindex].value;
  }

  if ( form.name == "group" ) {
    var myindex=form.urlgroup.selectedIndex
    location=form.urlgroup.options[myindex].value;
  }  
}